S
M
T
W
T
F
S
30
90°
70°
31
90°
70°
1
89°
69°
2
91°
70°
3
90°
69°
4
89°
69°
5
89°
68°
6
88°
68°
7
90°
69°
8
90°
69°
9
91°
68°
10
91°
69°
11
90°
69°
12
89°
68°
13
90°
68°
14
88°
66°
15
89°
65°
16
87°
65°
17
88°
64°
18
89°
57°
19
79°
56°
20
78°
57°
21
82°
58°
22
83°
57°
23
86°
61°
24
85°
61°
25
84°
60°
26
84°
60°
27
82°
59°
28
83°
60°
29
80°
55°
30
78°
57°
1
82°
58°
2
83°
58°
3
82°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Underwood
Underwood's September 2026 forecast shows daily high temperatures ranging from 78° to 91°, with overnight lows between 55° and 70°. The average high for September is 86° with an average low of 64°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Underwood. See also: October | November | December.
